This stainless steel adapter has an M8 thread on one side and a MFL thread on the other.
Note: This product is only the steel part! It is pictured here with an FFL duotight screwed onto it.
As seen in the image this allows it the screw into the outlet of the iKegger 1.0 Mini Regulator (now superceded by the iKegger 2.0 Mini Regulator) on one side and into a FFL to 8mm push fitting adapter on the other. This allows a quick and easy way to attach a gas line to the older style mini regulator